'Patterned' abrasion is a variety of: (AIIMS Nov 2012)
(Abrasion: An abrasion is a destruction of the skin, which usually involves the superficial layers of the epidermis only. They are caused by a lateral rubbing action, by a blow, by a fall on a rough surface, by being dragged in a vehicular accident, fingernails, thorns or teeth bite.
a. Scratches- thorn, pin, anything with a sharp or pointed end.
b. Grazes = slidingQ = scraping = grinding abrasion = brush burn- most common type, road accidents, dragging of body.
c. Pressure abrasionsQ = crushing = friction abrasion- ligature mark in hanging, strangulation.
d. Impact abrasionsQ = contact = imprint abrasion- force applied at right angle, person knocked by the headlight rim of a vehicle.
PatternedQ abrasion = impact abrasion and pressure abrasion.)